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标题: 问题求解，题目看起来简单，可是不明白具体意思。。。 [打印本页]

作者: c8143 时间: 2012-2-9 15:30 标题: 问题求解，题目看起来简单，可是不明白具体意思。。。

Question 27

Twenty students take an exam. The percentages of questions they answer correctly are ranked from lowest to highest as follows:

32	49	57	58	61
62	64	66	67	67
68	69	71	72	72
74	76	80	82	83

In a frequency distribution from 30% to 90% that is divided into six equal-sized intervals, the absolute frequency of the sixth interval is:

A) 2.

B) 4.

C) 1.

D) 3.

有个帖子给的答案是 D，我不明白，求解！

作者: cheng302a 时间: 2012-2-16 17:13

回复 1# c8143
The sixth interval is 80%-90%，so 80%，82%，83% is included，3 is correct。

作者: sophiaus 时间: 2012-3-27 07:52

30%-90% into 6 bins: (90-30)/6 = 10.
                        Bin 1: 30%-40%
                              2:  40%-50%
                              3: 50%-60%          4: 60%-70%    5: 70%-80%
                              6: 80%-90%
Question asking about the sixth interval's frequency, which is the frequency between 80%-90%. There are 3 of it (80%, 82%, 83%). Answer is D.

作者: 小王帅太阳 时间: 2012-4-9 23:04

新人，题目看懂了，只是全英文也未免太难了吧

作者: liushuai91 时间: 2012-6-27 21:47

考得其实是英语

作者: JasonZ666 时间: 2012-10-8 22:41

一楼正解，二楼详解

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